Optical brightening composition mixture of three analogous compounds

ABSTRACT

An optical brightener composition consisting of an unsymmetrical bis-triazinylamino-stilbene disulfonic acid and of the two corresponding symmetrical compounds is superior to the single components as regards the degree of whiteness obtained thereby and the multiplicity of applications for brightening of fibrous materials of cellulosic and polyamide fibers.

United States Patent Frischkorn et al.

[151 3,655,574 [451 Apr. 11,1972

OPTICAL BRIGHTENING COMPOSITION MIXTURE OF THREE ANALOGOUS COMPOUNDS Inventors: Hans Frischkorn; Erich Schinzel, both of Hofheim/Taunus; Gunter Rosch, Altenhain/Taunus, all of Germany Assignee: Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius & Bruning, Frankfurt/Main, Germany Filed: Jan. 12, 1970 Appl. No.: 2,396

Foreign Application Priority Data Jan. 18, 1969 Germany ..P 19 02 445.4

US. Cl. ...252/30l.2 W, 260/240 B Int. Cl ..Co9k l/02 Field of Search ..252/301.2 W, 301.3 W;

Primary Examiner-Robert D. Edmonds Attorney-Curtis, Morris & Safford [5 7] ABSTRACT An optical brightener composition consisting of an unsymmetrical bis-triazinylamino-stilbene disulfonic acid and of the two corresponding symmetrical compounds is superior to the single components as regards the degree of whiteness obtained thereby and the multiplicity of applications for brightening of fibrous materials of cellulosic and polyamide fibers.

7 Claims, No Drawings tions. consisting of an unsymmetrical bis-(diaminotrizinyb ,amino)-stilbeneLdisulfonic acid and of the two corresponding symmetrical compounds.

- S.A.) to prepare.- unsymmetrical optical brighteners by con- .densationof 2 mols of a cyanuric acid halide, 1 mol: of 4,4- diaminofstilbenef2,2'-disulfonicacid or a salt thereof, 2 mols (taken together) ofv aniline and-chloroaniline and 2-mols of a further amine, e.g. morpholine, in 'anysequenceplt is stated .that, when ,usingin one, step a mixture of ,aniline and ;chloroa niline, symmetrical compounds are obtained to some extent, too. The compounds aresaid to be useful as'brightening agents for polyamide and cellulosic'fibres.

From US. Pat. No. 3,132,106 (patented May 5, 1964, to F.

G. Villaumeaassignor to American Cyanamide Company) a brightener composition is known which consists of the unsymmetrical condensation product of 1 mol 4,4'-diaminostilbene- 2,2'-disulfonic acid, 2 mols of ethanolamine and, taken together, 2 -mols of metaand paraaminobenzene-sulfonic acid, together with the corresponding=symmetrical compounds. The composition is 7 said to be .useful as optical brightener forpaper.

.In both these patents it is also described to prepare the pure ,tunsymmetrical compound by condensation of 4-amindo-4- nitro-stilbene-2,2'-disulfonic acid with cyanuric acid halide .and with .saidamines in two different steps, reduction of the nitrqgroup, e. g. with iron, to the amino group, condensation with a cyanuric acid halide and addition in two different steps, .ofthe amines, but using in one step of the amine addition another. amine ,thanthoseadded to the nitro intermediate.

It .now has been found that derivatives ,of bis-triazinyl- .-amino-stilbene-disulfonic acid being a mixture of compounds ;of='the,general formulae 1, II and Ill CII EHMQ CH IV C] in the second condensation step at temperatures of O-50 C., preferably l040 C, successively, with together 2 equivalents, preferably one equivalent of each of the amines of the fonnulae HX and HX, or, alternatively, with a mixture containing; preferably, one equivalent each of said amines and reacting, in the 3rd condensation step, the so-obtained intermediate, at a temperature not exceeding 100 C., with at least 2 equivalents, preferably an excess of no more than 4 equivalents of amine of formula HY and isolating the final condensation product as the free acid by acidification up to a pH of about 4.

The salts of the bis-triazinyl aminostilbenedisulfonic acid derivatives of the present invention are obtained by transformation of the free acids with salt forming agents, such as alkali metal hydroxides, sodium carbonate or sodium hydrogen carbonate, potassium carbonate, ammonia, or, more especially,

with an aliphatic primary, secondary or tertiary amine the aliphatic moiety of which preferably contains hydroxy groups, e.g.' ethanol-, diethanol-, or tn'ethanol amine. The fact that the bis-tri-azinylamino-stilbene-disulfonic-acid derivatives provided by the present process are composed of a mixture of the compounds of the 1 formulae 1, ll, III is, among others,

evidenced by thin-layer chromatography using authentic samconcentrations enabled to estimate that his statistically -in which X stands for an .anilino group, X 1 stands for a required ratio is in the above case approximately attained.

morpholyl; group, Y stands for a morpholyl or diethanolamino group and Me stands for the hydrogen ion, and alkali metal cation, the ammonium ion or, preferably, a quaternary ammonium ion deriving from an aliphatic primary, secondary or tertiaryamine, preferably containing hydroxy groups, can be prepared by a particularly advantageous method consisting of:

reacting an alkali metal salt of the condensation product of 1 equivalent of 4,4-diaminostilbene-(2,2)-disulfonic acid and 2 equivalents of cyanuric acid chloride having the formula IV according to the invention. However, said procedure does not ofier an advantage over the method of preparation as proposed by the present invention.

Moreover, the mixtures of the bistriazinylamino-stilbenedisulfonic acid derivatives of the invention showed to be excellently suitable as optical brighteners for fabrics made from cellulosic or polyamide fibers. In contradistinction to the great number of known brightening agents of the same series of compounds (cf. Ullmann: Enzyklopadie der technischen Chemie, 3rd edition, vol. ll (1960) page 690 et sequ.) the compositions of the invention consisting of unsymmetrical compounds are distinguished by an extraordinary multiplicity of applications. They yield on cotton, when applied by the exhausting process or in a peroxide bleaching bath at temperatures above 100 C, excellent brightening effects. However, a particularly high degree of whiteness is achieved by the padding process. Also in crease resistance finishing of cotton according to the wet-, moist-(thermoprocess yielding a material with a residual moisture about 5 to percent by weight) or dry cross-linking method of reactant resins, a remarkable degree of whiteness is attained. Moreover, very Then a solution of 12.5 parts of aniline in parts of acetone was added and the whole was heated for 1 hour to 40 C. while maintaining a pH between 5 and 6 by addition of about 67 parts of 3 N sodium carbonate solution. After ll.6 parts of morpholine had been added, the batch was heated for another hour to 40 C., the pH being maintained between 5 and 6 by dropwise addition of 67 parts of a 3 N sodium carbonate solution. Finally, 80 parts of diethanolamine were added and the whole heated to 97-l00 C. while distilling off aqueous acetone at a descending condenser. After refluxing for 5 hours, the pH was adjusted to 4 by addition of about 35 parts of concentrated hydraulic acid, the precipitate was suction-filtered after cooling and washed neutral with water. After drying, 122 parts of a product were obtained containing the compounds of the formula la, [la and [H11 (HEZ CH N good bleaching effects are obtained also on polyamide fibre. Particularly, at temperatures below 100 C., preferably 80 C., on polyamide fibers of the type of polycaprolactam excellent bleaching effects of a bluish tint are produced that can still be slightly improved by adding reducing bleaching agents.

The compounds of the invention show, when applied as optical brighteners on said types of fibers under the most various conditions of application, an outstanding degree of whiteness.

They are distinctly superior to the hitherto known single com-v pounds of the bis-triazinylamino-stilbene-disulfonic acid group especially in regard to their very good brightening effects in connection with a great variety of applications.

The salts of the products of the invention with an aliphatic primary, secondary or tertiary amine which preferably contains hydrochloric groups are, above all, suitable for the manufacture of highly concentrated liquid preparations. In the textile industry, preferred use is made of said preparations in particular for continuous processes presently increasingly adopted in practice because of the need for rapid dosage and redosage of the brightener and since avoiding the time-consuming and complicated process of pre-dissolving the commercial powders. A further advantage of the liquid preparations consists in that they do not dust.

The following examples serve to illustrate the invention. The parts and percentages are by weight unless otherwise mentioned.

EXAMPLE 1 Fifty parts of cyanuric acid chloride were dissolved in 220 parts of acetone and the solution was poured onto 960 parts of a mixture of ice and water. Subsequently, a solution of 49.5 parts of 4,4-diamino-stilbene-(2,2)-disulfonic acid in 390 parts of water and 36 parts of concentrated sodium hydroxide solution were allowed to run into the mixture while maintaining the pH value between 2.5 and 3.5 by simultaneous dropwisc addition of about 1 l5 parts of 3N sodium carbonate solution. The whole was allowed to react during l /fihours until no more 4,4'-diamino-stilbene-disulfonic acid could be traced.

N(JJH;CH;OH)1 lTTn.

in form of the free disulfonic acid. The yield amounted to percent of the theory taking into consideration a residual moisture of 5 percent.

A product of the same composition was obtained, when in a second condensation step a mixture of 12.5 parts of aniline and l 1.6 parts of morpholine, dissolved in 40 parts of acetone, were added and the whole was allowed to react at 40 C.

After it had been transformed into its sodium salt, the so-obtained product was separated in the thin-layer chromatogram on kieselgel GF (of E. Merck A.G.) according to STAHL into 3 main spots using as eluent a mixture of n-hexanol, pyridine, acetic acid ethyl ester, ammonia and methanol (of the ratio 5:5:5:5:3 parts by volume (see Journal of Chromatography 27 (1967), 413-422)) which could be identified by comparison with authentic samples of the compounds la, Ila and llla. The comparison compounds la and llla were prepared in known manner using in second condensation step 2 mols of aniline or morpholine and adding in the third step 6 mols of diethanolamine. The unsymmetrical comparison compound Ila was obtained starting from 4-nitro-4'-amino-stilbene-(2,2 )-disulfonic acid in the manner described above.

For the production of the triethanol ammonium salts as concentrated liquid preparations the reaction product obtained as described above was, after precipitation with a mineral acid, mixed moist with parts of triethanolamine, made up to 460 parts with water and stirred. The so-obtained turbid solution could be clarified by filtration and a liquid preparation of about 25 percent strength (calculated on the free disulfonic acid) was obtained, practically capable of storage unlimited in time.

EXAMPLE 2 5 the components lb, llb and lllb V SO3(-) 50 w and corresponding to a yield of 95 percent of the theory taking into account a residual moisture of about 5 percent.

EXAMPLE 3 A cotton fabric prebleached in known manner with hydrogen peroxide was, after drying, impregnated with a solution containing 2 g/ l of the composition of the compounds Ia, Ila and Illa prepared according to the invention, squeezed off between rollers up to a moisture content of 80 percent and 40 dried at 120 C. The fabric treated in said manner showed an excellent degree of whiteness of a bluish tint.

A knit fabric made from polyamide 6 was treated at a goods-to -liquor ratio of 1 10 with a bath containing 0.2 percent of the composition of compounds la, Ila and Illa prepared according to the invention and 1 ml of formic acid. The temperature of the bath was raised to 80 C., and the goods agitated therein for 30 minutes. After rinsing and drying the knit polyamide fabric showed an excellent degree of whiteness of a bluish tint.

We claim 1. A composition of matter consisting essentially of a mixture of compounds of the formulae A knit fabric made from prebleached cotton was treated in a bleaching bath containing 0.4 percent of a composition of compounds lb, IIb and 111k prepared according to the invenin which X is anilino, X is morpholyl, Y, which is the same on each triazinyl and in each of I, II and III, is morpholyl or diethanolamine, and Me is hydrogen, alkali metal, ammonium or a quaternary ammonium derived from a low-molecular primary, secondary or tertiary aliphatic amine, said compounds I, II and Ill present in a molar ratio of about 1'4: about '15: about 56, respectively.

2. The composition as claimed in claim 1, consisting of about 25 mol percent of compound I, about 50 mol percent of compound II and about 25 mol percent of compound III.

3. The composition as claimed in claim I, wherein ME is H NCH CHBZOH, H N(CI-I,Cl-I,OH), or HN(CH,CH OH 7v. 8 4. The composition as claimed in claim 1, wherein Y is 6. The composition as claimed in claim 1, wherein Y is N(CH CH OH) and Me is sodium. morpholyl and Me is hydrogen.

5. The composition as claimed in claim 1, wherein Y is 7. The composition as claimed in claim 1, wherein Y is N (CH CH OH) and Me is HN(CH CH,OH) 5 morpholyl and Me is sodium. 

2. The composition as claimed in claim 1, consisting of about 25 mol percent of compound I, about 50 mol percent of compound II and about 25 mol percent of compound III.
 3. The composition as claimed in claim 1, wherein ME is H3NCH2CH2OH, H2N(CH2CH2OH)2 or HN(CH2CH2OH)3.
 4. The composition as claimed in claim 1, wherein Y is N(CH2CH2OH)2 and Me is sodium.
 5. The composition as claimed in claim 1, wherein Y is N(CH2CH2OH)2 and Me is HN(CH2CH2OH)3.
 6. The composition as claimed in claim 1, wherein Y is morpholyl and Me is hydrogen.
 7. The composition as claimed in claim 1, wherein Y is morpholyl and Me is sodium. 